#include<iostream>
using std::endl;
using std::cout;
#include<map>
#include<string>
#include<set>
using std::set;
using std::string;
using std::map;

template<class T>
void display(T &con){
    for(auto &ele:con){
        cout<<ele<<" ";
    }
    cout<<endl;
}
int test0(){
    map<string,set<int>> _dic;
    _dic["hello"].insert(10);
    _dic["hello"].insert(20);
    for(auto &ele:_dic){
        cout<<ele.first<<" ";
        for(auto &ele2:ele.)
    }

}
int main(void){
    test0();
}